Engine-fuel-supply system.



C. F. SCHULZ.

ENGINE FUEL SUPPLY SYSTEM. APPLICATION FILED DEC-28.1915.

A% Patented June 25, 1918.

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ENGINE-FUJEL-SUPFLY SYSTEM.

invents,

specification ofhetters Patent. Patented J'H'PJHB %5, hil

Application filed December 2d, 1915. Serial No. 69,127

To all whom it mag concern:

Be it known that I, CARL F. Sorrow, a

citizen of the United States, residing at Jersey City in the county of Hudsonand State of New Jersey, have invented cei tain new and useful lmprovementsin Engine-Fuel- Supply Systems, of which the following is a specification. 1

in order to feed fuel such as gasolene to a hydro-carbon engine, it has been the practice in the past to place the supply tank abovethe carbureter so the fuel will travel by gravity to the carbureter or else force the fuel from the tank to the carbureter by an air pump driven by the engine; but more recently a vacuum tank is used that has a number of valves and levers operated by the engine so as to draw fuel from the supply tank to the vacuum tank from where it feeds by gravity to the carbureter.

- .One of the objects of my invention is to overcome objections to the above systems by providing a system for feeding fuel to the engine, that is simple, cheap to manufacture, install and maintain. Another object of my invention is to provide a pumping device has that has a minimum number of moving parts and which is automatic in its action.

Uther and further objects of my invention .will be apparent to any one skilled in the art by reference to the attached drawing whereinmy pumping device is shown connected that it may be connected tomore than one cylinder depending on thecharacteristics of t e engine and other devices. The chamber I i is connected by a fuel pipe 11 to a fuel-tank 12 that may be placed in any suitable position, in the drawing it is shown below the carburetor. A check valve '14 is locatedin the opening of pipe 11 to chamber 7. Leading from chamber"? is a' feed pipe 10 to the float chambers of oarbu'reter 4:. A check valve 13 is located at the-opening int chamber. 7.. e val e 1 :1 ms t to The chamber 8. is

of pipe 10 1 feed by gravity from chamber 7 to the carbureter a but will not allow fuel to come back in reverse direction. Valve 14 works in reverse order; 6., it' will allow fuel to come from the tank 12 to the chamber 7 but not in the opposite direction. 16 is a screw capfor fillin g an opening used for boring out the seat ror valve 1t and for renewing or cleaning the same. 15 is a relief valve whose object will be explained later. 18 is a two way valve which isspring mounted,

as by spring 19, onto the side of the pump.

casing. The valve 18 is normal ofl both its seats so as to let air into chamber 7.

The operation of my pumping system will now. be described. As the engine operates, diaphragm 17-i caused to move back and forth causing fuel to be drawn from the tank 12 to chamber 7 from where it feeds by gravity to the carbureter a. When the tloat chamber of the carbupeter is full and likewise pipe 10. the

chamber 7 will fill to a certain level when further pressure therein will cause relief valve 15 to open and allow the "fuel to run back into the pipe 11. It may be necessary sometimes to drain the carbureter and it is convenient to have a supply of fuel in chamher 7 as is the usual case so the float chamber order for the fuel to run from the chamber 7 to the carburetor float chamber it is neces-' sary to have atmospheric pressure in the chamber 7. This I accomplish by the double acting spring mounted valve 18 which is normally open to allow air to enterchamber 'l, but which work synchronously with diaphragm 17 so air is not drawn into chamher 7 on the induction stroke'of the diaphragm 17.

It willbe seen by one skilled in the art that changes may be made in the details shown in annexed drawing illustrating my invention without departin from the spirit thereof and the scope o the appended claims. Having thus described my invention, what lclis:

l. in an engine vfuel supply system an engine, a fuel tank, a carburetor connected to said engine, a pumping device divided one compartment be ng connected to said engine and the other to said jitank, said diaphragm being responsive to the suction of said engine whereby fuel s into two separate compartments by a flexi .ble diaphragm,

85 f'can be again readily filled for a start. In;

drawn from the tank to thecomparlment connected thereto, a feed pipe leading 1' rom' this compartment to said carbureter, and a adapted to establish atmospheric pressure in the chamber when said engine is ldle, for

the purpose described. a

2. In an engine fuel supply system, an engine, a fuel tank, a carbureter connected to said engine, a pumping device divided into two separate compartments by a flexible diaphragm, one compartment being connected to said engine and the other to said tank, said diaphragm being responsive to the suctionof said engine whereby fuel is drawn from the tank to the compartment connected thereto, a feed pipe leadlng from this compartment to said carbureter, and a spring mounted double acting valve adapted normally to establish atmospheric pressure in said compartment whereby fuel wiil feed to said carureter when sald pumping device is not operating. 4 3. In an engine fuel supply system, an eng1ne,;a fuel tank, a carbureter connected to said engine, a pumping device divided into from returning to valve in shunt to,s aid check valve, to allow fuel to return to the supply pipe when. the.

two separate chambers by a flexible diaphragm responsive to the engine suction,

one chamber being connected to said engine and the other by a supply pipe to said tank, whereby fuel is drawn from said tank, a check valve in said pipe to prevent the fuel said tank, and a relief fuel in the chamber reaches a certain height,

a feed pipe from said chamber to said car- 'bureter and a check valve in said feed pipe operating in an opposite direction from the .first mentioned valve, and a valve, responsive to.the engine suction, inthe last mentioned chamber for'preventing'air from entering' said chamber while the engine is operating but adapted to allow air to enter the chamber when said engine is idle for the purpose of allowing the fuel to .run from gine, a fuel,

the'chamber to the carbureter.

- 4. In an engine fuel supply-system, an.en

a suction chamberand a fuel reserve supply to carry the fuel from the fuel tank, a carbureter connected to the englneg a pumplng'device divided into the engine, a pumping device divided into a suction chamber and a fuel reserve supply chamber by a flexible diaphragm-responsive to the engine suction, a supply ipe connecting the fuel tank with the fue reserve supply chamber and a feed pipe running from this chamber to said carbureter and a relief valve opening from the supply chamber into the supply pipe for limiting the amount of fuel to be carried in said supply chamber, and means for allowing the fuel to feed to said carbureter when said engine is idle.

6. In an engine fuel supply system, an engine, a fuel tank, a carbureter connected to sa1d en ine a unitar um in device hav a y P ing a suction chamber and a fuel reservoir with a flexible corrugated diaphragm therebetween acted on by the suction of said engine whereby the movement of said diaphragm draws fuel from said tank into the fuel reservoir of the pumping device and a feed pipe to carry the fuel from the fuel reservoir in the pumping device to said carbureter.

7; In an engine fuel supply system, an engine, a fuel tank, a carbureter connected to said engine, a unitary pumping device having a suction chamber and ayfuel chamber with a diaphragm therebetween adapted to be acted on by the suction of said engine whereby the movement of said diaphragm draws fuel from said tank into the fuel chamber of the pumping device, a feedpipe chamber of the pumping device to said carbureter and an adjustab e relief valve openingirom said fuel chamber to a fuel tank pipe to limit the amount of fuel to be carried in the fuel chamber of the pumping device.

In witness whereof, I affix my signature.

CARL F. SCHULZ. 

